Progressive 444 Shocks For Harley Trike 2009-2018

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Progressive Suspension 444 Series FST Shocks For Harley Tri-Glide

After more than a decade of ruling the roads with the road proven shocks, Progressive Suspension unveiled another breakthrough design. Dubbed Frequency Sensing Technology (FST) for its unique ability to dynamically adjust damping as you ride. The result is superior performance no matter the road conditions. A top mount threaded preload adjuster allows for fine tuning with a simple twist of the cap.


  • Frequency Sensing Technology (FST) allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality
  • Adjust spring pre-load by hand - no special tool needed
  • Progressive-rate spring
  • Deflective disc valving
  • 13 1/2" length
  • Sold as a pair
  • Made in USA


  • Stock shock length is 13"- These are 1/2" longer to allow for a smoother ride
  • Shock lengths are measured fully extended, eyelet to eyelet on centers
  • A change in height at one end of the bike may require a change at the other
  • Changing ride height can potentially change the trail and mechanical trail
  • Heavy Duty shocks are recommended for bikes operated at or near the OEM maximum load rating over 50% of the time
  • Prior to purchasing shocks that are different than your OEM length, please verify that wheel and suspension travel can be altered without causing clearance issues to the swingarm, axle, frame, tire, fender, chain/belt and guard, and exhaust
This Product Fits:
Harley Davidson
Freewheeler FLRT 2015, 2016, 2017, 2018
Street Glide Trike FLHXXX 2010, 2011
Tri Glide Ultra Classic FLHTCUTG 20092018
Product Style RevZilla Item # Manufacturer Product # Availability
Standard / 13 1/2" Long 1075839 444-4074B In Stock: Ships within 24 hours
Heavy Duty / 13 1/2" Long 1075838 444-4073B In Stock: Ships within 24 hours


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Tri glide shocks
I noted the difference right away, not so the wife. These are a bear to adjust. I had to jack up the trike which unloads the rear suspension and remove the rear wheels. It is possible for me to adjust the shocks by hand. (2) One on the adjuster and the other on the spring and turn both. You also must measure for sag. Not something to do on a regular basis or on the road. If you need to change settings on a regular basis I would go with the Legend Air which RevZilla also sells.
November 13, 2016
1 year ago
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Why did you choose this?
RevZilla Store
highly recommended by fellow biker
Jim D on May 16, 2017
highly recommended by fellow biker
Jim D on May 16, 2017
Buddy installed 444 series on a full dresser and made his wife very happy. We will see what happens here.
Kenneth M on Feb 13, 2016
Buddy installed 444 series on a full dresser and made his wife very happy. We will see what happens here.
Kenneth M on Feb 13, 2016
These are recommended for HD Trikes...but you leave the "Simple Twist" adjuster on the top of the Shock. On a Trike? Wouldn't a trike shock need the adjuster on the bottom where you could get to it?
A shopper on Nov 14, 2015
BEST ANSWER: The adjuster goes to the bottom per directions.
have a rocket 3 triumph classic 2008 with a motor trike conversion is the progressive 444 suitable ?
A shopper on Jun 8, 2016